? Right now Mage (not only Frost one) is the only caster class who can stay a chance vs melees. And i don't see any PvP nerf in 7.1.5. Frost mage always was and always will be one of the best specs for PvP. If he's a fotm player, Frost is the best bet, if he want to play a caster class. But yeah, melee domination in PvP is ridiculous in Legion. But things can change in ONE "fix"
As you can see any melee can drop from fotm to unplayable in a one single nerf. Rogue is a very good example. Frost is the only range class/spec who can do something vs melee domination.
Any other caster that you recommend? Just don't say Warlock or SP, please